LookOut is a plugin which allows Thunderbird to interface with Microsoft's mail tools by decoding metadata and attachments encapsulated/embedded in a TNEF encoded attachment (aka winmail.dat).Support: Thunderbird and SeaMonkey

This Thunderbird add-on searches address book(s) for pairs of matching contact entries.It can automatically delete entries that have equivalent or less information than the other one.Any remaining matches are presented for manual treatment.

Contact Tabs enhances Thunderbird to give you quick access to all your contacts directly from Thunderbird's main window: Use the powerful search field to find your contacts and open them in a new tab for viewing and editing.

This Thunderbird add-on searches address book(s) for pairs of matching contact entries.It can automatically delete entries that have equivalent or less information than the other one.Any remaining matches are presented for manual treatment.